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AllDup vs Cisdem Duplicate Finder: catalog facts
AllDup	Cisdem Duplicate Finder
Free Freeware, free for private users and companies.	Paid Free download to try, with a paid license for full use.
Windows	Windows, macOS, iOS
Many comparison methods, including similar images and music Scans inside ZIP, RAR and 7Z archives	Compares files by content, not just names Finds similar photos as well as exact duplicates
Windows only Closed source	Full version requires purchase Closed source
Downloadable app	Downloadable app
Closed source	Closed source
License: Freeware	License not stated
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.